M-Bus, what is it?

The M-Bus (meter bus) is a cost-optimized field bus for the transfer of energy consumption data. A central master - in the simplest case a PC with level converter - communicates by a 2 wire bus with the bus users (up to 250 slaves per segment: Heat meter, water meter, electrical meter, gas meter... and also sensors and actuators of any type). 
More and more manufacturer implement the electrical M-Bus interface with protocol layer into their meters. The M-Bus is european standard and described in the standards EN13757-2 and EN13757-3.

Advantages of the M-Bus system

  • standard field bus system (EN13757-2 / EN13757-3)
  • two-wire bus with power supply of the bus users
  • no special requirements to the bus cable (electricity installation cable or telephone cable is enough)
  • almost any wiring topology (line, star and tree)
  • large extension (up to some kilometers)
  • remote reading of consumption data (heat, water, gas and electricity ..)
  • communication with sensors and actuators of any type
  • energy monitoring and - optimization
  • leakage monitoring
  • applicable in the industry and in private households
  • good availability of system components
  • superior costing / performance relation
  • remote read out with modem possible from any place

Modell of a M-Bus installation